Thanks, I'll take a look at it. ----- Original Message ----- From: "Miguel Saiz Arnedo" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Monday, June 10, 2002 6:27 AM Subject: Re: [rtl] FFT functions in RTLinux
> Hello. > > I respond myself to say that with Mr.Hofrats help I've found a pckage of fft > functions that will work in rt_threads. > > The link is ftp://ftp.fsmlabs.at:/pub/rtlinux/math/fft.tar.bz2 > > It contains various files including a readme which is a good starting point. The > fft functions are in fft_mayer.c. Here you can find: > fft(n,real,imag),ifft(n,real,imag) which calculates the complex direct and > inverse fft transform over the complex vector real+j*imag of n elements. It > returns results in the same vectors. It must be noted that ifft gives an > unnormalized result so that the execution of ifft(fft(v)) will return same > vector v multiplied by the number of points. > I haven't used the rest of the functions defined but I guess they work in a > similar way. > Note that fft_mayer.c includes the header file trigtbl.h (which comes in the > package) so make sure you have it in hand when compiling. > For copyright info see in fft_mayer.c. > > Missatge citat per: Miguel Saiz Arnedo <[EMAIL PROTECTED]>: > > > Hello. > > > > I need to call fft (fast fourier transform) functions in my rtthreads. I > > found > > in the internet a packet of fft functions called FFTW which I've been > > using in > > normal linux without any problems. FFTW uses math functions so you must > > be link > > your programs with -lm, in addition to -lfftw. > > But when I try to call FFTW from rtthreads I get some problems. In > > inserting the > > module y get some unresolved symbols in functions like malloc, fflush, > > free, > > exit, stderr, stdout, fprintf, sprintf. Does this mean that FFTW can't > > be used > > in RTLinux? > > Anyway, I can get rid of those unresolved symbols by linking in de C > > library > > -lc. But I get some new unresolved symbols in --udivdi3, --umoddi3 and > > --moddi3 > > (this last one isn't new). How can I get rid of those? > > If the final conclusion is that I can't use FFTW in rtlinux, does anyone > > know > > about some pack of fft functions which will work? > > > > Thanks in advance and best regards. > > > > Miguel. > > -- [rtl] --- > > To unsubscribe: > > echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR > > echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] > > -- > > For more information on Real-Time Linux see: > > http://www.rtlinux.org/ > > > > > -- [rtl] --- > To unsubscribe: > echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR > echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] > -- > For more information on Real-Time Linux see: > http://www.rtlinux.org/ > -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] -- For more information on Real-Time Linux see: http://www.rtlinux.org/
